Add a script to remove tracks from the previous federation (as they cannot be served anymore)
Those are the uploads matched by Upload.objects.filter(library=None)
and Upload.objects.filter(source__startswith='http').exclude(library__actor__user=None).exclude(source__contains='youtube')
In [1]: from funkwhale_api.music.models import Upload
In [2]: from funkwhale_api.music.serializers import UploadActionSerializer
In [3]: UploadActionSerializer
Out[3]: funkwhale_api.music.serializers.UploadActionSerializer
In [4]: queryset = Upload.objects.filter(library=None, source__startswith='http').exclude(library__actor__user=None).exclude(source__contains='youtube')
print('Found {} matching uploads'.format(queryset.count()))